4 Computing the RT band, 300-1000 K

Since no easy rescaling was possible, as both the intensity and especially the spectral shapes change with temperature, we computed the new spectra based on the semi-classical moments and using the usual lineshape profiles BC and K0, as in the original paper by Borysow et al. (1988). The test made at 300 K with this slightly simplified approach turned out to be highly satisfactory, so we proceeded in this way at the higher temperatures, where the semi-classical moments are increasingly more suitable. In this way, we obtained entirely new and accurate spectra. The computations were based on the SK potential and the same dipole moment functions as used by Borysow et al. (1988) for all contributing terms $\lambda_1 \lambda_2 \Lambda L$ = 2023, 2021, 2233 and 4045.